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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa10634a265abfce0d6b1187d3261a1cdfedcba28db244bf8d01c0ea3f542dfc' 
  AND token = 'i4NbgSXnxfALqN+9YvP0JzfwA8SeBQluWyXGonitoug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}